﻿using System;
namespace Velocity4Net.Runtime.Directives
{

    /*
     * Licensed to the Apache Software Foundation (ASF) under one
     * or more contributor license agreements.  See the NOTICE file
     * distributed with this work for additional information
     * regarding copyright ownership.  The ASF licenses this file
     * to you under the Apache License, Version 2.0 (the
     * "License"); you may not use this file except in compliance
     * with the License.  You may obtain a copy of the License at
     *
     *   http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing,
     * software distributed under the License is distributed on an
     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
     * KIND, either express or implied.  See the License for the
     * specific language governing permissions and limitations
     * under the License.
     */










    /**
     * This class,the #stop directive which allows
     * a user to stop the merging and rendering process. The #stop directive
     * will accept a single message argument with info about the reason for
     * stopping.
     */
    public class Stop:Directive
{
    private const StopCommand STOP_ALL = new StopCommand("StopCommand to exit merging");

    private bool hasMessage = false;

    /**
     * Return name of this directive.
     * @return The name of this directive.
     */
    public String getName()
    {
        return "stop";
    }

    /**
     * Return type of this directive.
     * @return The type of this directive.
     */
    public int getType()
    {
        return LINE;
    }

    /**
     * Since there is no processing of content,
     * there is never a need for an internal scope.
     */
    public bool isScopeProvided()
    {
        return false;
    }

    public void init(RuntimeServices rs, InternalContextAdapter context, Node node)
    {
        super.init(rs, context, node);

        hasMessage = (node.jjtGetNumChildren() == 1);
    }

    
    public override bool render(InternalContextAdapter context, Writer writer, Node node)
    {
        if (!hasMessage)
        {
            throw STOP_ALL;
        }

        Object argument = node.jjtGetChild(0).value(context);

        // stop all and use specified message
        throw new StopCommand(String.valueOf(argument));
    }

    /**
     * Called by the parser to check the argument types
     */
    public void checkArgs(ArrayList<Integer> argtypes,  Token t, String templateName)
      {
        int kids = argtypes.Count;
        if (kids > 1)
        {
            throw new MacroParseException("The #stop directive only accepts a single message parameter",
               templateName, t);
        }
    }

}
}